59% (1975)

57% (1984)

65% (1970)

57% (1982)

53% (1985)

45% (1976)

68% (2004)

56% (1975)

50% (1979)

63% (1974)

69% (1977)

48% (1970)

45% (1975)

44% (1980)

57% (1980)

61% (1980)

59% (1983)

58% (1967)

50% (1978)

45% (1980)